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Start new Socket Sub-connection to Access Point
SIOCIFSTART and SIOCIFACTIVESTART are actual ioctl( ) calls which would start a connection or subconnection. All the socket communication calls such as connect(), read(), write(), send(), receive(), sendto(), and recvfrom() should come after calling SIOCIFSTART and SIOCIFACTIVESTART. Calls such as getsockopt(), and getsockname() that do not require any connection do not have any dependency on SIOCIFSTART and SIOCIFACTIVESTART.
The code to start a new socket connection can be seen here.
The following code shows how to start a new subconnection using an existing connection.
void NewSubconnection(char *ifname)
int sockfd1, sockfd2;
// Name of the interface
sockfd1 = socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP);
ioctl(sockfd1, SIOCIFSTART , &ifr);
sockfd2 = socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP);
//Start subconnection using a connection created earlier
ioctl(sockfd2, SIOCIFACTIVESTART , &ifr);
//recvfrom() and sendto() operations on socket sockfd2 and sockfd1
ioctl(sockfd2, SIOCIFSTOP, &ifr); // Stop the connection
ioctl(sockfd1, SIOCIFSTOP, &ifr); // Stop the connection